Refer to the chapter called Mail Transport Agent (MTA) Configuration in the RedHat Enterprise Linux System Administration Guide for further details.3.2.1. The Default Postfix InstallationThe Postfix executable is /usr/sbin/postfix. This daemon launches all related processesneeded to handle mail delivery.Postfix stores its configuration files in the /etc/postfix/ directory. The following is a list of themore commonly used files:• access — Used for access control, this file specifies which hosts are allowed to connect toPostfix.• aliases — A configurable list required by the mail protocol.• main.cf — The global Postfix configuration file. The majority of configuration options arespecified in this file.• master.cf — Specifies how Postfix interacts with various processes to accomplish maildelivery.• transport — Maps email addresses to relay hosts.ImportantThe default /etc/postfix/main.cf file does not allow Postfix to accept networkconnections from a host other than the local computer. For instructions onconfiguring Postfix as a server for other clients, refer to Section 3.2.2, “BasicPostfix Configuration”.When changing some options within files in the /etc/postfix/ directory, it may be necessaryto restart the postfix service for the changes to take effect. The easiest way to do this is totype the following command:/sbin/service postfix restart3.2.2. Basic Postfix ConfigurationBy default, Postfix does not accept network connections from any host other than the local host.Perform the following steps as root to enable mail delivery for other hosts on the network:Postfix195
